Backport EE YAML settings for PostgreSQL

config/database.yml.postgresql

@@ -9,6 +9,15 @@ production:
   username: git
   password: "secure password"
   host: localhost
+  # load_balancing:
+  #   hosts:
+  #     - host1.example.com
+  #     - host2.example.com
+  #   discover:
+  #     nameserver: 1.2.3.4
+  #     port: 8600
+  #     record: secondary.postgresql.service.consul
+  #     interval: 300
 
 #
 # Development specific